/**
 * 
 */
package com.luck.pf.security;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;

/**
 * 说明: Copyright: Copyright (c) 2010 最核心的代码就是invoke方法中的InterceptorStatusToken
 * token = super.beforeInvocation(fi);这一句，即在执行doFilter之前，进行权限的检查，
 * 而具体的实现已经交给accessDecisionManager了，下文中会讲述
 * @author zhangwenrui 2010-8-6 下午04:05:55
 * @version 1.0
 */
public class MyFilterSecurityInterceptor extends AbstractSecurityInterceptor
		implements Filter {
	private FilterInvocationSecurityMetadataSource securityMetadataSource;

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		FilterInvocation fi = new FilterInvocation(request, response, chain);
		invoke(fi);
	}

	public FilterInvocationSecurityMetadataSource getSecurityMetadataSource() {
		return this.securityMetadataSource;
	}

	public Class<? extends Object> getSecureObjectClass() {
		return FilterInvocation.class;
	}

	public void invoke(FilterInvocation fi) throws IOException,
			ServletException {
		InterceptorStatusToken token = super.beforeInvocation(fi);
		try {
			fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
		} finally {
			super.afterInvocation(token, null);
		}
	}

	public SecurityMetadataSource obtainSecurityMetadataSource() {
		return this.securityMetadataSource;
	}

	public void setSecurityMetadataSource(
			FilterInvocationSecurityMetadataSource newSource) {
		this.securityMetadataSource = newSource;
	}

	public void destroy() {
	}

	public void init(FilterConfig arg0) throws ServletException {
	}
}
